I had the same problem and I know why
First off.
In Windows 7 your world of warcraft folder will not be in programme files folder.
It will be like this path: Computer > Local Disk (C > Users > Public > World of Warcraft

What you did wrong is that you chose a saved variables folder withing one of your character name folders.

You need to take the one in your account name folder directly.
So the patch will be similar to this:
Computer > Local Disk (C > Users > Public > World of Warcraft > WTF > Account > [your account name]
In this folder there is a saved variables folder with the correct .lua file.